Enhance Shopware role: fix init script permissions, CSP for data: fonts, and unify shell usage

- Added 'font-src data:' to CSP whitelist to allow inline fonts in Admin UI
- Refactored init.sh to run as root only for volume permission setup, then drop privileges to www-data
- Unified all bash invocations to sh for POSIX compliance
- Added missing 'bundles' named volume and mount to Docker Compose
- Set init container to run as root (0:0) for permission setup
- Added admin user rename step via Ansible task

See discussion: https://chatgpt.com/share/69087361-859c-800f-862c-7413350cca3e

roles/web-app-shopware/templates/docker-compose.yml.j2

@@ -7,6 +7,7 @@ x-environment: &shopware
     - thumbnail:/var/www/html/public/thumbnail
     - sitemap:/var/www/html/public/sitemap
     - "{{ SHOPWARE_INIT_HOST }}:{{ SHOPWARE_INIT_DOCKER }}:ro"
+    - bundles:/var/www/html/public/bundles
   working_dir: {{ SHOPWARE_ROOT }}
 
 {% include 'roles/docker-compose/templates/base.yml.j2' %}
@@ -22,6 +23,7 @@ x-environment: &shopware
     <<: *shopware
     container_name: "{{ SHOPWARE_INIT_CONTAINER }}"
     entrypoint: [ "sh", "{{ SHOPWARE_INIT_DOCKER }}" ]
+    user: "0:0"
 
 {% include 'roles/docker-container/templates/networks.yml.j2' %}
 
@@ -113,5 +115,7 @@ x-environment: &shopware
     name: {{ entity_name }}_thumbnail
   sitemap:
     name: {{ entity_name }}_sitemap
+  bundles:
+    name: {{ entity_name }}_bundles
 
 {% include 'roles/docker-compose/templates/networks.yml.j2' %}